<?php

/**
 * @package admin
 * @copyright Copyright 2003-2015 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: split_page_results.php 18926 2011-06-13 04:44:17Z drbyte  Modified in v1.6.0 $
 */
class splitPageResults
{
    function __construct(&$current_page_number, $max_rows_per_page, &$sql_query, &$query_num_rows)
    {
        global $db;

        if ($max_rows_per_page == 0) $max_rows_per_page = 20;
        $sql_query = preg_replace("/\n\r|\r\n|\n|\r/", " ", $sql_query);

        if (empty($current_page_number)) $current_page_number = 1;
        $current_page_number = (int)$current_page_number;

        $pos_to = strlen($sql_query);

        $query_lower = strtolower($sql_query);
        $pos_from = strpos($query_lower, ' from', 0);

        $pos_distinct_start = strpos($query_lower, ' distinct', 0);
        $pos_distinct_end = strpos(substr($query_lower, $pos_distinct_start), ',', 0);

        $pos_group_by = strpos($query_lower, ' group by', $pos_from);
        if (($pos_group_by < $pos_to) && ($pos_group_by != false)) $pos_to = $pos_group_by;

        $pos_having = strpos($query_lower, ' having', $pos_from);
        if (($pos_having < $pos_to) && ($pos_having != false)) $pos_to = $pos_having;

        $pos_order_by = strpos($query_lower, ' order by', $pos_from);
        if (($pos_order_by < $pos_to) && ($pos_order_by != false)) $pos_to = $pos_order_by;

        $sql = ($pos_distinct_start == 0) ? "select count(*) as total " :
                                            "select count(distinct " .
                                             substr($sql_query, $pos_distinct_start + 9, $pos_distinct_end - 9) . ")
                                             as total ";
        $sql .= substr($sql_query, $pos_from, ($pos_to - $pos_from));
        $reviews_count = $db->Execute($sql);

        $query_num_rows = $reviews_count->fields['total'];

        if ($max_rows_per_page == '') $max_rows_per_page = $query_num_rows;
        if ($query_num_rows == 0) $max_rows_per_page = 1;
        $num_pages = ceil($query_num_rows / $max_rows_per_page);
        if ($current_page_number > $num_pages) {
            $current_page_number = $num_pages;
        }
        $offset = ($max_rows_per_page * ($current_page_number - 1));

// fix offset error on some versions
        if ($offset < 0) {
            $offset = 0;
        }

        $sql_query .= " limit " . $offset . ", " . $max_rows_per_page;
    }

    function display_links($query_numrows, $max_rows_per_page, $max_page_links, $current_page_number, $parameters = '', $page_name = 'page')
    {
        global $PHP_SELF, $zcRequest;
        $current_page_number = (int)$current_page_number;
        if (zen_not_null($parameters) && (substr($parameters, -1) != '&')) $parameters .= '&';
        if ($max_rows_per_page == 0) $max_rows_per_page = 20;
        if ($query_numrows == 0) return '';

// calculate number of pages needing links
        if ($max_rows_per_page == '' || $max_rows_per_page == 0) $max_rows_per_page = $query_numrows;
        $num_pages = ceil($query_numrows / $max_rows_per_page);

        $pages_array = array();
        for ($i = 1; $i <= $num_pages; $i++) {
            $pages_array[] = array('id' => $i, 'text' => $i);
        }

        if ($num_pages > 1) {
            $display_links = zen_draw_form('pages', $zcRequest->readGet('cmd'), '', 'get');

            if ($current_page_number > 1) {
                $display_links .= '<a href="' . zen_admin_href_link($zcRequest->readGet('cmd'), $parameters . $page_name .
                                  '=' . ($current_page_number - 1)) .
                                  '" class="splitPageLink">' . PREVNEXT_BUTTON_PREV . '</a>&nbsp;&nbsp;';
            } else {
                $display_links .= PREVNEXT_BUTTON_PREV . '&nbsp;&nbsp;';
            }

            $display_links .= sprintf(TEXT_RESULT_PAGE, zen_draw_pull_down_menu($page_name, $pages_array, $current_page_number, 'onChange="this.form.submit();"'), $num_pages);

            if (($current_page_number < $num_pages) && ($num_pages != 1)) {
                $display_links .= '&nbsp;&nbsp;<a href="' . zen_admin_href_link($zcRequest->readGet('cmd'), $parameters .
                                   $page_name . '=' . ($current_page_number + 1)) .
                                   '" class="splitPageLink">' . PREVNEXT_BUTTON_NEXT . '</a>';
            } else {
                $display_links .= '&nbsp;&nbsp;' . PREVNEXT_BUTTON_NEXT;
            }

            if ($parameters != '') {
                if (substr($parameters, -1) == '&') $parameters = substr($parameters, 0, -1);
                $pairs = explode('&', $parameters);
                foreach($pairs as $pair) {
                    list($key, $value) = explode('=', $pair);
                    $display_links .= zen_draw_hidden_field(rawurldecode($key), rawurldecode($value));
                }
            }

            if (SID) $display_links .= zen_draw_hidden_field(zen_session_name(), zen_session_id());

            $display_links .= '</form>';
        } else {
            $display_links = sprintf(TEXT_RESULT_PAGE, $num_pages, $num_pages);
        }

        return $display_links;
    }

    function display_count($query_numrows, $max_rows_per_page, $current_page_number, $text_output)
    {
        $current_page_number = (int)$current_page_number;
        if ($max_rows_per_page == 0) $max_rows_per_page = 20;
        if ($max_rows_per_page == '') $max_rows_per_page = $query_numrows;
        $to_num = ($max_rows_per_page * $current_page_number);
        if ($to_num > $query_numrows) $to_num = $query_numrows;
        $from_num = ($max_rows_per_page * ($current_page_number - 1));
        if ($to_num == 0) {
            $from_num = 0;
        } else {
            $from_num++;
        }

        return sprintf($text_output, $from_num, $to_num, $query_numrows);
    }
}
